linux-kernel - [PATCH 4.4 09/14] sparc/ptrace: Preserve previous registers for short regset write

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Message-Id: <20170330094946.487865710@linuxfoundation.org>
Date:   Thu, 30 Mar 2017 11:58:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.4 09/14] sparc/ptrace: Preserve previous registers for short regset write

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Martin <Dave.Martin@....com>

commit d3805c546b275c8cc7d40f759d029ae92c7175f2 upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin <Dave.Martin@....com>
Acked-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/sparc/kernel/ptrace_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -311,7 +311,7 @@ static int genregs64_set(struct task_str
 	}

 	if (!ret) {
-		unsigned long y;
+		unsigned long y = regs->y;

 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 &y,